Matthew Abraham, 20, was last seen about 9 p.m. Wednesday at his home on Dobie Lane in Scotts Valley, said Santa Cruz County sheriff’s Sgt. Paul Tashiro.

Abraham’s family believes he left about 6 or 7 a.m. Thursday because they heard the family dog move around the house then, deputies said.

Abraham suffered head trauma in a mountain bike crash on March 8, which may have made him disoriented, deputies said. He fell more than 50 feet from a trestle on to sand in Henry Cowell Redwoods State Park, injuring his head near his left temple, according to YouTube video he posted Tuesday.

“I don’t really remember much of Friday or any of last week really,” Abraham said in the video. With his left eye swollen shut, he added, “I was out for about 24 hours and I’m starting to recover slowly.

“At the moment it feels like someone has dug pliers into my skull and they’re trying to tear it open.”

Sheriff’s Lt. Steve Carney described Abraham as an energetic young man. Abraham’s family believed he did not go far because of his injury.

More than 10 members of a Search and Rescue team scoured Scotts Valley and other areas Thursday afternoon.

“They did a pretty thorough search in Henry Cowell and a huge area around his house,” Carney said Thursday afternoon. They planned to use search K-9s Thursday night near his home, he said.